Time counting circuit and counter circuit

Details Time counting circuit and counter circuit Time counting circuit and counter circuit

1996-03-27

1998-10-27

Wambach, Margaret Rose

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Measuring or testing

377 20, G01C 2100

Patent

active

058287175

ABSTRACT:
There is provided a time counting circuit for measuring a pulse spacing of a pulse signal with high accuracy and with low power consumption.
An inverter ring composed of an odd number of inverters connected in a ring oscillates and one signal transition occurs after another as though seemingly circulating around the inverter ring. Holding circuits connected to respective output terminals of the inverters composing the inverter ring output, on the rising edge of a pulse signal to be measured, signals outputted from the inverters at the same time. The outputted signals are then converted by a signal converting circuit to numeric data. A counter circuit connected to the output terminal of one of the inverters composing the inverter ring counts the number of circulations of signal transition. A time-difference operating circuit corrects the numeric data outputted from the signal converting circuit based on the number of circulations of signal transition outputted from the counter circuit to provide time data, while calculating and outputting the pulse spacing of the pulse signal to be measured.

REFERENCES:
patent: 4370067 (1983-01-01), Iwakura et al.
patent: 4908784 (1990-03-01), Box et al.
patent: 4953095 (1990-08-01), Ishikawa et al.
patent: 5166959 (1992-11-01), Chu et al.
T. Watanabe et al., "A Time-to-Digital Converter LSI", Technical Report of IEICE, pp. 37-43, Aug. 1993.

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